Chiral liquid crystal dopants based on terpenoid acids

The twisting power and compatibility of several oxygenand nitrogen-containing derivatives of terpenoid acids (maleopimaric, citraconopimaric and fumaropimaric) in liquid crystal (LC) compositions with positive anisotropy of permittivity (LC-1285, Merck LC-6809-000, LC-6810-000, BN-104) were studied. Chiral nematic LC compositions were prepared based on the synthesized optically active terpenoid products. The twisting power of the chiral additive (dopant) and the helix pitch of the resulting LC compositions were determined using the Cano-Grandjean wedge method. The effect of the structure (presence and type of substituents, length of alkyl, alkoxy and mesogenic groups) of the terpenoid dopant on the twisting power and compatibility with LC materials is analyzed. The thermal stability of a number of maleopimaric acid derivatives (amides, imidoamides) is studied by derivatography and its dependence on the compound structure is analyzed. Data on the values of specific rotation of the plane of polarized light ([α]_D) are presented for a number of the compounds obtained. Electro-optical characteristics of some obtained chiral LC compositions with additives of maleopimaric amides and imidoamide were determined. It was shown that the developed dopants enable the synthesis of LC materials with controlled selective light transmission, promising for use in energy-efficient “smart windows” and smart glasses for privacy control systems.

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